Basionym Name:Verrucaria planiuscula Nyl., Expos. Synopt. Pyrenocarp.: 58 (1858)
Homotypic synonyms:Anisomeridium planiusculum (Nyl.) R.C. Harris, More Florida Lichens, Incl. 10 Cent Tour Pyrenol. (New York): 149 (1995)Anthracothecium planiusculum (Nyl.) Müll. Arg., Flora, Regensburg 71(13): 208 (1888)Arthopyrenia planiuscula (Nyl.) Zahlbr., Cat. Lich. Univers. 1: 310 (1921)Leiophloea planiuscula (Nyl.) Trevis., Conspect. Verruc.: 9 (1860)Pyrenula planiuscula (Nyl.) Tuck., Proc. Amer. Acad. Arts & Sci. 7: 233 (1868)